I did enjoy this, although only know a handful or Eric Clapton's songs, I actually knew more of Sheryl Crow's songs.
Steve Boyce Band average,
Robert Randolf, different and entertaining
Jason Mraz, really enjoyed this mellow acoustic set
John Mayer, not my cup of tea, but his music is good
Sheryl Crow, highly enjoyable, knew most of the songs
Eric Clapton, the show didn't properly light up until Wonderful Tonight, that's when the atmosphere started to get really good. I found myself almost bored through the middle of one song in particular which was extended to 12 minutes, i don't know which because im not highly familiar with Clapton's material.

This is the first show I've ever been to in London, and if given the chance I'd go to another. Unfortunately I had a flight back the next night so didn't get to see The Police (who i'd have seen in a gunshot instead).